如何理解composer的错误

如何理解composer的错误，很多新手对此不是很清楚，为了帮助大家解决这个难题，下面小编将为大家详细讲解，有这方面需求的人可以来学习下，希望你能有所收获。

composer遇到的错误汇集

1#权限错误

file_put_contents(/home/vagrant/.composer/cache/repo/https---packagist.laravel-china.org/packages.json): failed to open stream: Permission deniedhttps://packagist.laravel-china.org could not be fully loaded, package information was loaded from the local cache and may be out of date

解决方法：sudo chown -R $USER ~/.composer/

2# zlib_decode():data error

Failed to decode response: zlib_decode(): data errorRetrying with degraded mode, check https://getcomposer.org/doc/articles/troubleshooting.md#degraded-mode for more info

解决方法 更换composer的repo.packagist

3# SSL routines:ssl3_get_server_certificate:certificate verify failed

错误描述

- Installing phpunit/phpunit (6.5.8): Downloading (failed)Downloading (failed)Downloading (failed)    Failed to download phpunit/phpunit from dist: The "https://files.phpcomposer.com/files/sebastianbergmann/phpunit/4f21a3c6b97c42952fd5c2837bb354ec0199b97b.zip" file could not be downloaded: SSL operation failed with code 1. OpenSSL Error messages:error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failedFailed to enable cryptofailed to open stream: operation failed    Now trying to download from source

解决方案

In my case, it was the CA Cert file that was the culpritOpen terminal and run php -r "var_dump(openssl_get_cert_locations());"Note the location of default_cert_file. It might say \usr\local\ssl\cert.pemVerify that that file exists. If not, download the cacert.pem file from https://curl.haxx.se/ca/cacert.pem and place it in somewhere preferably in /usr/local/sslYou now have a file is usr/local/ssl/cacert.pemOpen your php.ini and add the location of the file openssl.cafile=cacert.pemRun composer config --global cafile "/usr/local/ssl/cacert.pem"If it's of any use to others, I use valet+ 1.0.26, composer 1.8.4 OSX Movajes 10.14.3, php7.3 and simply specifying the cert composer looks for with:composer config --global cafile "/usr/local/etc/openssl/cert.pem"

composer config --global cafile "C:/AMP_ENV/php-7.1.15/ca/cacert.pem"composer config --global --list

4# proc_open(): fork failed - Cannot allocate memory

错误描述

Installation failed, reverting ./composer.json to its original content.The following exception is caused by a lack of memory or swap, or not having swap configuredCheck https://getcomposer.org/doc/articles/troubleshooting.md#proc-open-fork-failed-errors for detailsPHP Warning:  proc_open(): fork failed - Cannot allocate memory in phar:///usr/local/bin/composer/vendor/symfony/console/Application.php on line 952Warning: proc_open(): fork failed - Cannot allocate memory in phar:///usr/local/bin/composer/vendor/symfony/console/Application.php on line 952  [ErrorException]  proc_open(): fork failed - Cannot allocate memory

解决方式

sudo dd if=/dev/zero of=/var/swap.1 bs=1M count=1024sudo mkswap /var/swap.1sudo swapon /var/swap.1

5# 执行 composer 抛出 Killed

错误描述

root@test2:/work/usrc$ composer require qcloud/cos-sdk-v5./composer.json has been updatedThe "extra.asset-installer-paths" option is deprecated, use the "config.fxp-asset.installer-paths" optionLoading composer repositories with package informationUpdating dependencies (including require-dev)Killed

解决方式

出现此原因大多因为缓存不足造成，在linux环境可增加缓存解决。

free -msudo mkdir -p /var/_swap_cd /var/_swap_sudo dd if=/dev/zero of=swapfile bs=1M count=2000sudo mkswap swapfilesudo swapon swapfilesudo echo "/var/_swap_/swapfile none swap sw 0 0" >> /etc/fstabfree -m

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